) William Epps, Rogelio Angulo, Dwayne Brayboy, and Fondel larr were arrested by a drug task force conducting a reverse sting wherein undercover police officers pose as drug dealers, sell drugs to 'urchasers, and then arrest the purchasers for possession of the rugs).1 The arrestees were charged with trafficking in cocaine and ther offenses. Epps, Angulo, and Brayboy appeal their convictions of rafficking in cocaine. Because possession of cocaine is an essential dement of trafficking in cocaine, and because law enforcement mthorities arrested appellants before they acquired possession of the cocaine, we must reverse their convictions based on an insufficiency of supporting evidence. Remaining issues are moot.

Construed in a light most favorable to support the verdict, the evidence showed that a City of Doraville police sergeant was told by a confidential informant that a man later identified as Angulo wanted to purchase a kilogram of cocaine. The sergeant decided to conduct a reverse sting with the assistance of a DeKalb County drug task force. The sting was conducted at an apartment complex in Doraville where Brayboy resided. The informant met Angulo at the apartment complex entrance. They were driving their respective cars. The informant was in possession of a block of cocaine weighing almost 998 grams.

Epps and Barr later arrived in Epps’s truck with the purchase money. After going to Brayboy’s apartment, Epps and Angulo returned with Brayboy to the informant’s car. Epps and Angulo went to the rear of the vehicle and asked to see the cocaine. The informant had put the cocaine on the backseat of his car, and he took it out and *646showed it to Epps and Angulo. At Epps’s request, the informant unsealed the cocaine. The informant also cut a piece out of it. Epps then bent down, smelled the cocaine, and took a piece of it to test at Brayboy’s apartment.

After Epps, Angulo, and Brayboy went back to Brayboy’s apartment and tested the cocaine, they returned to the area of the informant’s car to make the purchase. Epps and Angulo approached the car while Brayboy remained in the background. Angulo placed the money in the backseat of the car. The informant, however, had put the cocaine in the trunk of his car at the direction of the police sergeant who wanted to hide the cocaine from the appellants because he was concerned they might try to steal it. Observing that the cocaine had been moved from its prior location, Angulo asked where it was. The informant asked where the money was. When Angulo told the informant the whereabouts of the money, the informant alerted task force officers by prearranged signal that the buy had been completed. The informant continued giving the signal while telling the appellants that the cocaine was in his trunk. When the informant opened the trunk, the officers converged on the scene and arrested Epps, Angulo, and Brayboy. As the trunk was opened, Epps and Angulo stood approximately three feet from the informant’s car.

“The relevant element of trafficking in cocaine is knowing possession of 28 grams or more of cocaine. Possession may be joint or exclusive and actual or constructive.”2 “ ‘A person who knowingly has direct physical control over a thing at a given time is in actual possession of it. A person who, though not in actual possession, knowingly has both the power and the intention at a given time to exercise dominion or control over a thing is then in constructive possession of it.’ [Cits.]”3 “ Tf one person alone has actual or constructive possession of a thing, possession is sole. If two or more persons share actual or constructive possession of a thing, possession is joint.’ ”4 “Spatial proximity alone is insufficient to prove joint constructive possession of contraband.”5

The State argues that the evidence in this case supports a finding that when Epps inspected the cocaine and acquired actual possession of a piece of it, he and the other appellants, along with the informant, were in joint constructive possession of the entire block of cocaine. Alternatively, the State argues that once the appellants paid the purchase price for the cocaine, they obtained constructive posses*647sion of it as a result of their apparent ability to overpower the informant and take the cocaine from him.

We cannot agree with either of these arguments. The appellants could not have been in constructive possession of the entire kilogram of cocaine when Epps conducted his inspection, because they indisputably lacked the intention to exercise dominion or control over it until they had tested the sample. Upon tendering the purchase price to the informant, the appellants clearly possessed the intent to exercise control over all of the cocaine, but the evidence is insufficient to show that they ever acquired the power of control so as to give them constructive possession, as the informant hid the cocaine from them by placing it in his closed trunk until the police arrived to make the arrests. This is simply a case in which authorities conducting a sting arrested the subjects before they acquired possession of the drug and then obtained convictions against them for an offense which has possession of the drug as an element.6 Applying the law to the facts as established by the evidence, we must reverse the convictions for trafficking in cocaine.

Judgments reversed.

dissenting.

I respectfully dissent. Whether sufficient evidence was presented from which the jury could have convicted the defendants of the crime charged is a close question. But given the circumstances of this case, I believe the issue of whether the defendants had the ability to exercise control over the contraband, even though it was in the trunk of the informant’s vehicle, was properly submitted to the jury and that evidence existed from which a rational trier of fact could have concluded that the defendants were in constructive possession of the cocaine.